Fabrications of Dendrimer/Metal Oxide Nanoparticle Hybrids and Their Environmental Low Load Assemblies

本课题的研究目的是在最佳条件下合成树枝状分子保护的金属氧化物纳米粒子，制备其一维和二维组装，并将其与线性聚合物杂交，以阐明其作为多功能传感器、环境低负载系统或金属氧化物器件的功能。以亲水性树枝状聚合物、聚胺基胺树枝状聚合物和具有硅氧基焦点和长链间隔物的聚酰胺基胺树枝状分子为保护剂，制备了纳米二氧化钛纳米粒子。纳米粒子稳定地分散在水中，没有二次聚集。纳米粒子的大小和稳定性取决于金属离子与树枝状聚合物的比例，而不是树枝状聚合物的生成，即当树枝状聚合物的比例较高时，可以得到尺寸小、分散稳定的纳米粒子。树枝状聚合物保护的纳米二氧化钛光催化剂对TH-…的催化性能一种水污染物的光降解率高于无保护纳米粒子，且在高代时表现更好。结果表明，保护纳米二氧化钛的树枝状聚合物具有足够的空隙体积来保存客体分子，并且除了作为保护剂外，还可以有效地作为客体分子的储存库。结果表明，所合成的二氧化钛纳米颗粒在水中具有良好的光催化活性，有望成为一种环保的减负材料。在乙酸锌乙醇溶液中加入0℃的氢氧化钠乙醇溶液，制备了硅氧基聚焦树枝状保护的纳米氧化锌颗粒。X-射线光电子能谱证实树枝状保护的纳米氧化锌中形成了锌-氧-硅共价键。Si-O-Si键的峰显著地取代了C-O-Si键的峰。这些事实表明，与纳米氧化锌键合的树枝之间的聚集体与树枝自身的聚集体共存。此外，为了保持纳米氧化锌的分散性，将G3树枝状纳米颗粒-氧化锌纳米复合材料掺杂到聚甲基丙烯酸羟乙酯的膜中。纳米粒子在膜中分散良好。这一成果为金属氧化物/树枝状杂化光降解体系向环境低负荷型光降解体系发展迈出了一步。较少

The purpose of the research subject is the synthesis of dendrimer-protected metal oxide nanoparticles at the optimum conditions, the fabrication of their one-dimensional and two-dimensional assemblies and their hybridization with linear polymers for the clarification of functionality as multifunctional sensors, environmental low load systems, or metal oxide devices. Titanium oxide nanoparticles were synthesized using hydrophilic dendritic polymers, poly(amido amine) dendrimer and poly(amido amine) dendrons with siloxy focal point and long alkyl chain spacers, as a protector. Nanoparticles were stably dispersed in water without secondary aggregation. The size and stabilization of nanoparticles depended on the ratio of metal ions with dendritic polymers rather than the dendrimer generation, tha is, nanoparticles with small size and stable dispersion were produced at high ratio of dendritic polymers. The ability of dendritic polymeer-protected TiO_2 nanoparticles as a photocatalyst for th … More e photodegradation of a water-pollutant was higher than that of nonprotected nanoparticle and superior at higher generation. It was suggested that the dendritic polymers protecting TiO_2 nanoparticle have enough void volume to conserve guest molecules and behave effectively as a reservoir of guest molecules besides as a protector. It can be concluded that the synthesized titanium dioxide nanoparticles can be expected as a environmental load-lowering materials, since they are effective as a photocatalytic compound in water.ZnO nanoparticles protected by siloxy focal dendron were synthesized by adding a NaOH ethanol solution at 〜0℃ to a zinc acetate ethanol solution. It was confirmed from X-ray photoelectron spectroscopy that Zn-O-Si covalent bond was formed in dendron-protected ZnO nanoparticles. The peak for Si-O-Si bond remarkably appeared instead of the peak for C-O-Si bond. These facts indicate that aggregates between dendrons bonding to ZnO nanoparticles coexist with self aggregates of dendrons. Additionally, in order to maintain dispersibility of ZnO nanoparticles, G3 dendron-ZnO nanoparticle composites were doped in a membrane of poly 2-hydroxyethyl methacrylate. Nanoparticles were dispersed well in the membrane. This achievement is a step for developing hierarchic organization of metal oxide/dendron hybrid to photodegradation system of environmental low load type. Less